The Junior River Run has been a tradition at Mandarin Oaks Elementary School for years. The training program's goal is to show kids the benefits of exercise and prepare them for race day. The aim is to have them run 8.3 miles in training and then one mile on race day, covering the full 15k distance.

The event announced that all slots for the day — the 15K, 5K, mile challenge, the Junior River Run and the diaper dashes — have been filled for the 47th running of the iconic road race in Jacksonville.